Datasheet

ADS1258-EP

www.ti.com

SBAS445D –MARCH 2009– REVISED MARCH 2011

CONFIG1: CONFIGURATION REGISTER 1 (Address = 01h)

7 6 5 4 3 2 1 0

IDLMOD DLY2 DLY1 DLY0 SBCS1 SBCS0 DRATE1 DRATE0

Default = 83h.

Bit 7 IDLMOD

This bit selects the Idle mode when the device is not converting, Standby or Sleep. The Sleep mode

offers lower power consumption but has a longer wake-up time to re-enter the run mode; see the Idle

Modes section.

0 = Select Standby Mode

1 = Select Sleep Mode (default)

Bits DLY[2:0]

6–4 These bits set the amount of time the converter will delay after indexing to a new channel but before

starting a new conversion. This value should be set large enough to allow for the full settling of

external filtering or buffering circuits used between the MUXOUTP, MUXOUTN, and ADCINP,

ADCINN pins; see the Switch Time Delay section. (default = 000)

Bits SBCS[1:0]

3–2 These bits set the sensor bias current source.

0 = Sensor Bias Current Source Off (default)

1 = 1.5µA Source

3 = 24µA Source

Bits DRATE[1:0]

1–0 These bits set the data rate of the converter. Slower reading rates yield increased resolution; see

Table 4. The actual data rates shown in the table can be slower, depending on the use of Switch Time

Delay or the Chop feature. See the Switch Time Delay section. The reading rate scales with the

master clock frequency.

DATA RATE DATA RATE

AUTO-SCAN MODE FIXED-CHANNEL MODE

DRATE[1:0] (SPS) (SPS)

11 23739 125000

10 15123 31250

01 6168 7813

00 1831 1953

CLK

= 16MHz, Chop = 0, Delay = 0.

Product Folder Link(s): ADS1258-EP